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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83dc4c64aef6299ae603eb6a68681bb6ca040ef7e941829fb65bf48a9ceec0f0' 
  AND token = 'iQyguN7aIDgVXvmoUodU6+T0MXPoO1IMJsLy6kWsww0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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