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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09eba29c11b6993ec1426002983f68359970c60df9e4a9cc5c1a7dd3cdc5a92d' 
  AND token = 'HsIDaVA+EBpS/sQjfnXD+qnQI6QRRNc+LJBGXPx/3QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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