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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eebf9f90630657097d21da992d15dc61aee3068912086004baaca88e9e5b113d' 
  AND token = 'jpEAeB3rSKb2Q71kYjd6MvyuqEyTbuMj2rtzNuXFK8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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