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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '904e7fc8daf6a9e23745fd0a51094194b177bfa011390fd90ff74227d5472329' 
  AND token = 'hh1d60Zu32gFwqaULV+t3hWiyRa0QCnaT+RKpuqPPSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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