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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '801d662d56c93ac13479f05f7bb6996fb83a4479190fd49825bdc4e86f5fd543' 
  AND token = 'm799kWtDtBMa+WVYNHVHxAfFgmyXt63TJrOdlOURv1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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