SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce66b8b225c1abdd7f78d2562a883bfd615277b0bc950b4fb41b9838946c3001' 
  AND token = 'LsIBZABWhZzbtLkb7ATKHVjlh5i4c+kVGCaSqf5MX+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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