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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a55904b0988e0911056ff83028818c0d387cbb15bf61d81d1e94449c6f6295c' 
  AND token = 'U7GSwOPnXAMGDa+YzGax1M5M4dcbg6fc750M2MRyE40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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