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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ccca8f7b29d0a02cd5cda67ef7c609e0f4b08ffc9fc15d8757b90af14a9e93' 
  AND token = 'gB4f5Mw6n7P0a/xL/WicXBZealD//l8ql31AvXdv6eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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