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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e196218691e530d4e7cde1ef9c68311b386a62145ca251e3f768f03dc308f95f' 
  AND token = 'VU6/wEZJiSX5iRyswKFyiwKFnJ5jGp88Y9yVE8YTrRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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