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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b3715da3e2ebda42e9feccbf76522e8924e5ed227a743aedf3807f8bd57f03' 
  AND token = 'lLV6ePOz4wM0s4YFJcbYofvzLwIIU+yKVbizkKwuevE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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