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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '140bc299ae370095ac2e37e0224cb6c9c3fafe266f31bcc60a06a7a4294d0cac' 
  AND token = '61aQz2UEX69ISJj/H0+RnRlKhjnP7qIu4DZ69Z3sUXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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