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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91070aed5694397a8f613312e55b33a94df50216eaefb28a4d6c78e8fe4ac56b' 
  AND token = 'hmg4d6Jxcgn//DYT1FuOE8iRbpWt24L+S+yDs7wTKo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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