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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47ed9d9c8680b1f769a7ab8df0bee2ad439f755efb0ce353e32e2d208e0c3d8f' 
  AND token = 'x7rEl97S8N4jOfgx5Lhg50EsZPip618YP7V8KvSGypI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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