SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e02fa65d833fb6b78400540619c3a01e26d50ff29ae652a3cdd0915a1bb4d19c' 
  AND token = 'WueOrFV4nSQzMvhb+auUHkQ+kmXvxS7GYWIyJu7GsgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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