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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37541df2202904a70a8fa7fb35acaf32304ebf5ab59cb56bfa951a7064b7374' 
  AND token = 'gGWxAp4BKF8QU87MR/XHluUE3Nl10l7Lbi+W30KfBZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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