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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24b029e86e6c6724956b522b5b1966727129749552980bfb4c3a84ec0503ca1d' 
  AND token = 'zez07jgehxHDhV5WF6/mDdXOUdQMeJ+iM2DnPOY4Pkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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