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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4507cc8d4e185740eb8d327091b2bf5af678fbabe47bacc45a3bdae0309d48a' 
  AND token = 'pf8M3ZQSqOBjtPmW1NxU2XbpyVx7j8HzJKQKk5LvOmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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