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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24208193f9078bb43af665ca1fa9c45af36eb09ebca07df0c5d0635a40231ec1' 
  AND token = 'eZK6evvHVSXDky6zvx4SMaE8r93Jsw4FW0ef8xa4mGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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