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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c73beff7919e3fc239b72c955db7fcb54564abec7d469acef5a5849f6f9cda56' 
  AND token = 'lDlcMzAoj40USDqrF5cJUtKj0qe1ERvbrn68cFTWhzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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