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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b6b8bd8e8e9d6a4718e88dd13125dce7e8d641b719bcc486920894c4ffd8aef' 
  AND token = 'JiLh5OCKuabPWsMHZ5TSzTlWMpVnTcjQ2BKOO6OfRrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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