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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f619be8b9429aa7cb70d2cc91b0f7df5d570908e46c05ad1c653bc8cbf7907' 
  AND token = 'VBxAsPcpyG0GsKvJKLKgh0YRSGeKUh3lhyy0nc1ynWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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