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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62bcd62023d62ef165d949c6eb3cbdb522c329e4f90ba9da874cff27ff4b8af' 
  AND token = 'sJ87YMVCJ6jmc0A2m2MxwM8l4e64IzXuJW123hdnDpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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