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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceef91ad22e231aaffec33c980bb1f322478bfb009d6ca898154e902bf8f6ccd' 
  AND token = '4dCz32RMB9yYigucsRlN9bRYg2ZW6fkQoYKpqBk5YhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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