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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47e20cbeb01b98ed0412903b99baff5881cb85ec61efa4a4f64a121a44f2e769' 
  AND token = 'iQspjrrhxKzTJGVxioyOe6XLaGQyhbUKLjdjg/8RN7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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