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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a3696902fb294e359ea96fd91e2b814be2cee44a61838e0f865452bb89ff7e2' 
  AND token = '/zUGTg7KvHy4rRHTiIM93qrfIXFh6BgfQkq9IenxgBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}