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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40b5ffc1d857f7ecfd9c017456f5448fdb3fab0ca42f9f1b790114a9e825b19' 
  AND token = 'Io/122zmZzke2OWDj8tflhnW75AxmhjMy3VOWRlS/yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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