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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '455f45588c3ad8cd34b0a12d4b1fb75e9edd80dcfb4160fc02cd593d6df613c7' 
  AND token = '1oxRZaOmnOK4bhiVJaMOUl7dfe49VSsv7Tr86zfMl1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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