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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '140c6858be508920b915eab76d151248b3498dd3513e5aae260c888506da0c79' 
  AND token = 'fCz8zx4mlstWs3FmbjGpVhH3ISP62HHS/yUQS4UO3fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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