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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '280c391e482c384225a6d1e584ce2602d4f753fbefeaf746623d2319ba456fb8' 
  AND token = 'wfF+W2X0tGWi5F4QRisls28sbiu9t7Qv1Iuk9LmmMvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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