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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faac6897cf1fd0edfe26192b3426122861a1b49ef6db67f3c0c18eb11c2e1fc4' 
  AND token = 'gMj6yObmQod+ZRB/YB3YxcL5EDfkoS5CzT44TiiYdLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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