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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37459092a771268a6cf957b64df5a8e242a41feb1b2b3fb8ca7aaf4423eb976' 
  AND token = '35oBctw7fhWUwHw7SJd8NbxE21ts7lHTVnj/YL2WW4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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