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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ffcec7bf06334a11e8ffe6933fe6eb7dc267d5842fc1f992a4ea72d6b94e54' 
  AND token = 'p732G3/Xw6s+VOL4dDUmA/Dt0RoDL4jMhn5TvoVzXEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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