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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c43a04ba92a2e48d62a61408a18296868e3ed6956cdefaa302d11334c37794e6' 
  AND token = 'UwNd2bCDJhJokxkmc6oj/j/IG52o/nQf1JyPKHOkTsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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