SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '165b8a2518996fa5e82ac2b22306f273fe671ad0c158f2b2a4fbdfe7d495a08c' 
  AND token = 'FodW7oTe/nEHbPxvvzYhGQJMSHJm2bl4rW/r43tJKqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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