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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '447be5fd46cb20d6cfddbc4575597206c1b29edb3ea2378b9e330d0510b60f0a' 
  AND token = 'xbbBP/RBnBdzfvNzE3mvJ1wUYfQgxGTqxRMyOdUz5ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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