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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40abb8d66bd8bf5abda6f4dee7ec39c5b1f513803546a8bbd0dbdaf2b5ac2ac9' 
  AND token = 'sP6qww6XCNT8xbb33KR+MaLOUi/0u6+7rM3khOwS34E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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