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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c21e09e42363c37336787aa442a1022d1ba730d27882765a6ae5d586c70012aa' 
  AND token = 'mzkioV/TIhNim7H551KmaVv0uvtD6qZ8XHrk9LigR+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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