SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e7cb197f7c1c3fa648a789446cdbf7a438333f06b739150b425a246fd538e33' 
  AND token = 'Iml1z+vKnjUWcsggSy7fs21P7OTqmut3qjWjpQZY120=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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