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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a97bc8f1d977b3988518fb260f254b0fa5f4e09f08e2438c015e0a138dae44a9' 
  AND token = 'SeG5X/eax4FD5OvjOz2zQI9/NhgBAGPx0f2Wpf5ySVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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