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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a5c312bdaeab24af1550b6267eb8fbe0a98d90bd5666435fd1fb28c00cd5ba' 
  AND token = '3jQiAwpSGGT4X8jFv6ui3Z3hkKz7Sd1nLCXbzX8ROws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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