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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92cf591b46a7224262bda3157e8c89a08dd901ebd2116baeae22386c2fb32105' 
  AND token = '3rLvAHbLR05U+Q36yWpSynPzDu2EeVBQVjfavU5RzRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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