SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17bb49f6a81bf110c9364bf526b3d4e9609f57894d457c485fc7a9e0ffc30e83' 
  AND token = 'zNI+GAUq2/9ibsXnrXXLm97wa+VRDhXWLu14OR3+SKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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