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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '424aa1a333ba971a2d710632275b6f678e8a833a48c504e429c7b636816fb725' 
  AND token = 'oUdUjmGVjVErNREtECYblYO2FlvNoiF1/24Fm7QoNQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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