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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '216824c799c1c072d34db14674450f34994b69fd1c9ac278a85abf94512c7c77' 
  AND token = 'jST9EeJiZVKQfOYEsrTWpcbv4ZEqKZbQkEgTuK8kfqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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