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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c15d5d17de7b04a44c809d354b34fb9c4132b634ec0cb73a3f3100224f2ff81' 
  AND token = 'gAc7lOcEWz3mXZRTf+bX3d0CKXRhyzDydeeBKS3ZYeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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