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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57de93d053313ef08513e0daba170f6a96ea5a772478afe7cc2fb3c9144165d5' 
  AND token = 'upDLwMg7ySiSPx3Cs3Y5mhdMhGHhB7pS/eEXNTde3fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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