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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf9217e7142d0a6b8cda8fb965473c06ce114697d34201e9561f553e5b8e317f' 
  AND token = 'BgtdQtGY9uJQ1M0oMhECir1Z0M8iybBB93p6s5aDDnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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