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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa5430e5aa125a4d9fe95e4584f5451b3af11288a9c1ef359372fda7cea26997' 
  AND token = 'TVloDp/3rWxF/uL3tvbe0ggFQa0duuX5rBFrpMqYb5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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