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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f4cbc7baef5e0ccffa195e46b89e641fef3911dfa28646f3b54e2bc53494df9' 
  AND token = 'VQZ+6P+uxi4EbLu3LPL7+YEIVFTm4IZHxHsv0zprLqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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