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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91f4d95354af7f7894d9fab27a90d50914324b2d05251bda6629a801f3311637' 
  AND token = 'gZkISjM/sMLx89n9bYqZEpoAI8MPlKCdfeJ3c1zbrAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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